Control for wick type liquid fuel burners



April 25, 1933. G. G. LENNMOR 0 1 CONTROL FO R WICK TYPE LiQUID nFUEL BURNERS Filed Aug. 14, 1951 2 .Sheet-Sheet 2 u INVENTOR. Gosro & Len-nmon 3 ATTORNEY L 17 is provide Patented Apr. 25, .1933

UNITED STATES PATENT OFFICE GOSTA. GBEGORIUS LENNMOR, OF STOCKHOLM, SWEDEN, ASSIGNOBI, BY MESNE ASSIGN- MENTS, 1'0 ELECTROLUX SEBVEL CORPORATION, OF NEW TION OF DELAWARE YORK, N'. Y., A CORPORA- CONTBOL FOR TYPE LIQUID FUEL B'U'RIN'ERS Application filed August 14, 1931, Serial no. 557,079, and in Germany September 27, 1930.

This invention relates to automatic control means for wick type liquid fuel burners.

One object of this invention is to provide an automatic temperature responsive means for controlling the size of the flame of a wick type liquid fuel burner and thereby the heating effect.

A device contemplated by this invention is especially suitable for controlling the heating of refrigerating apparatus of the absorption typeinwhich a wick type burner for liquid fuels is used to heat the generator where other sources of heat are not available or desirable.

The invention will be more fully understood by reference to the following description taken in connection with the accompanying drawings, in which Fig. 1 shows a wick type liquid fuel burner with a thermostatic device for controlling the adjustment of the wick;

Fig. 2, a side view, partly in vertical section, of the thermostatic device; and

Fig. 3 shows a modified arrangement whereb the extent of wick immersed in liquid uel is varied rather than the height of the wick.

Referring toFig. 1 of the drawings there is shown a wick type liquid fuel burner having a reservoir or fuel chamber 10 adapted to contain oil, kerosene, alcohol, or the like. A wick 11 extends from within the reservoir upwardly through a guide 12, and a rotatable wick adjusting member 13 turns the wick 11 up or down by means of the usual mechanism, not shown, in the guide 12.

Supported by the reservoir 10 on one side thereof, as shown, is the temperature responsive control mechanism comprising a circular cap 14 on which are mounted integrally therewith two upright bearing posts 15 and 16. Slidably journaled in the upper ends of the bearing posts is a rod .17 on which a pinion 18 is s lined or feathered. The rod on one end with a knob 19 and on the other end with one member 20 of a positive drive clutch, the other member 21 of which is secured to the wick adjusting member 13. A sprin 22 around the rod 17 normally maintains t e clutch in its operative position. Near the bottom of the bearing posts is pivoted a segmental gear or rack 23 which meshes with the pinion 18.

A casing 24 is secured to the under side of the cap 14 and forms therewith a hous ing for the sylphon bellows 25 which has its open end secured to a'shoulder 26 within the upper part of casing 24 with a fluid tight joint and has its closed end extending downwardly into the bottom of the casing 24. The bellows 25 is maintained in its normal position by a spring 27 mounted between the closed end of the bellows and the under side of the cap 14. A push rod 28 is fastened to the free end of the bellows 25 and extends upwardly through an opening 29 in the cap 14, its other end being connected at 30 to an eccentric portion 31 of the segmental gear or rack 23.

The lower end of the casing 24 communicates through a fluid tight conduit 50 with a bulb 33 which contains a suitable operating fluid, thus forming a thermostat well are is transmitted throu h the conduit 50 and exerted upon the bel ows 25 in the easing 24. Movement of the bellows responsive to the pressure change is transmitted by the push rod 28 to the segmental gear 23 which rotates the pinion 18 and thereby the wick adjusting member 13 through the rod 17 and the clutch. The knob 19 and the spring pressed clutch permit regulation of the burner flame so that the desired amount of heat is obtained with the thermostatic device disconnected. A stop 32 is desirable to limit the movement of the segment 23.

If the burner is used to heat the generator of an absorption type refrigerating apparatus, the bulb 33 may contain water and be.

obtained by controlling the amount of fuel flowing to the burner. The wick 49 of burner 34 extends downwardly into the fuel chamber 35 which latter preferably has'a small horizontal cross section. This container communicates through a substantially horizontal conduit 36 with an auxiliary container 37 open at the top or arranged in some manner that the contents thereof are subjected to atmospheric pressure. The auxiliary container is connected to a fluid tight fuel reservoir 38 through a feed pipe 39 which extends from the fuel reservoir and opens near the bottom of the auxiliary container. The fuel reservoir may be filled through an opening closed bya fluid tight plug 40. A pipe 41 from the upper part of the fuel reservoir is connected by a flexible conduit 42 to an air inlet pipe 43 which is arranged to be raised and lowered within the auxiliary container 37 by a thermostat 44. As shown, the operating rod 45 of the thermostat 44 is connected to one end of a lever 46, which is fulcrumed at 47 and has its other end connected to raise and lower the pipe 43.

When the pipe 43 is raised so that its 0 ening is above the liquid level in the auxi iary container 37, air asses into the fuel reservoir 38 allowin el to flow through pipe 39 to the auxihary vessel 37 and raise the level therein until the opening of pipe 43 is closed, whereby the level in the fuel container 35 is also raised, thus immersing a greater portion of the wick 49 to increase the burner flame. When the pipe 43 is lowered so that its opening is below the liquid level in the auxiliary vessel 37, the fuel consumed by the burner 34 is not replaced from the reservoir 38 as no air enters through pipe 41 and the flame is reduced. Since the thermostat 44 is connected to raise and lower the pipe 43, the fuel level in the burner 34, and thus the size of the burner flame, is controlled responsive to the temperature to which the bulb 48 of the thermostat is subjected.

It will be obvious to those skilled in the art that various other changes may be made in the construction and arrangement without departing from the spirit of the invention and therefore the invention is not limited to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

What'is claimed is: V

1. A wick type liquid fuel burner and means for controlling the supply of fuel to said burner comprising an open top container, a substantially horizontal conduit betweensthe lower part of said container and the lower part. of the fuel chamber of said burner, a fluid ti ht fuel reservoir above said container, a el supply line from the lower part of said reser vo1r to the lower part of said container, a pipe having a flexible portion, one end of sald pipe communicating with the upper part of said reservoir and the other end opening within said container, a thermostat, and means operated by said thermostat for controlling the height of said pipe opening within said container.

2. A wick type liquid fuel burner and means for controlling the supply of liquid fuel to said burner comprising a container open to atmosphere and communicating with said burner, a fluid tight fuel reservoir above said container, a fuel supply line from the lower art of said reservoir to the lower part 0 said container, an air inlet conduit from the upper part of said reservoir extending within said container and terminating therein in an opening of adjustable height, and a thermostat connected to control the height of said opening.

3.-A wick type liquid fuel burner and -means for controlling the supply of liquid fuel 'tosaid burner comprising a container open to atmosphere and connected to said burner, a fluid tight fuel reservoir above said container, .a fuel supply line from said reservoir to said container, an air inlet conduit communicating with the upper part of said reservoir and adapted to be closed responsive to the liquid fuel level in said container, and a thermostat connected to control the level at which said conduit will be closed.

4. A wick type liquid fuel burner, a fluid tight fuel reservoir above said burner, means for conducting fuel from said reservoir to said burner by ravity, and means for controlling the a mission of air above the liquid level in said reservoir responsive jointl to the level of liquid in said burner. and c a-nge in temperature produced by said burner.

5. A wick type liquid fuel burner, a fluid tight fuel reservoir'having' an air inlet in the upper part thereof, means for conducting fuel from said reservoir to said burner by gravity, and temperature responsive means for controlling the admission of air through said reservoir inlet opening.

6. A wick type liquid fuel burner and means for controlling'the supply of liquid fuel to said burner com rising, a fluid ti ht fuel reservoir, means or conducting el from said reservoir to said burner by gravity, an air inlet conduit to the upper part of said reservoir, means for opening and closing said conduit re onsive to the liquid lever in said burner, an thermostatic means for modifying the operation of the last said means.

7. In a wick type liquid fuel burner su plied with fuel by 'avity from a fluid tig t reservoir, means or admitting air above the liquid level in the reservoir responsive to the liquid level in the burner, and thermal responsive means for modifying the ration of last said means to control the liquid level in the burner.

8. In a wick type liquid fuel burner sugplied with fuel by gravity from a fluid tig t reservoir, means for admitting air above the liquid lever in the reservoir responsive to the liquid level in the burner, and means for modifying the operation of last said means to control the liquid level in the burner.

In testimony whereof I afiix my signature.

GGSTA GREGORIUS LENNMOR. 

